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This class is meant to be thread safe. In fact, its headerdoc statement on thread safety even mentions this. All fields on the class are readonly except the child isolate preparer. This field is set during VM instantiated isolate initialization. The VM may launch multiple isolate in the same isolate group on at the same time (each on a VM backed thread pool thread). Attempting to set the field without synchronization is a data race. Fixes https://github.com/flutter/flutter/issues/49358 Fixes b/147798920
72 lines
2.3 KiB
C++
72 lines
2.3 KiB
C++
// Copyright 2013 The Flutter Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#ifndef FLUTTER_RUNTIME_DART_ISOLATE_GROUP_DATA_H_
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#define FLUTTER_RUNTIME_DART_ISOLATE_GROUP_DATA_H_
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#include <mutex>
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#include <string>
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#include "flutter/common/settings.h"
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#include "flutter/fml/closure.h"
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#include "flutter/fml/memory/ref_ptr.h"
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namespace flutter {
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class DartIsolate;
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class DartSnapshot;
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using ChildIsolatePreparer = std::function<bool(DartIsolate*)>;
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// Object holding state associated with a Dart isolate group. An instance of
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// this class will be provided to Dart_CreateIsolateGroup as the
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// isolate_group_data.
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//
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// This object must be thread safe because the Dart VM can invoke the isolate
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// group cleanup callback on any thread.
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class DartIsolateGroupData {
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public:
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DartIsolateGroupData(const Settings& settings,
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fml::RefPtr<const DartSnapshot> isolate_snapshot,
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std::string advisory_script_uri,
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std::string advisory_script_entrypoint,
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const ChildIsolatePreparer& child_isolate_preparer,
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const fml::closure& isolate_create_callback,
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const fml::closure& isolate_shutdown_callback);
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~DartIsolateGroupData();
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const Settings& GetSettings() const;
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fml::RefPtr<const DartSnapshot> GetIsolateSnapshot() const;
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const std::string& GetAdvisoryScriptURI() const;
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const std::string& GetAdvisoryScriptEntrypoint() const;
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ChildIsolatePreparer GetChildIsolatePreparer() const;
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const fml::closure& GetIsolateCreateCallback() const;
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const fml::closure& GetIsolateShutdownCallback() const;
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void SetChildIsolatePreparer(const ChildIsolatePreparer& value);
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private:
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const Settings settings_;
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const fml::RefPtr<const DartSnapshot> isolate_snapshot_;
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const std::string advisory_script_uri_;
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const std::string advisory_script_entrypoint_;
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mutable std::mutex child_isolate_preparer_mutex_;
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ChildIsolatePreparer child_isolate_preparer_;
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const fml::closure isolate_create_callback_;
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const fml::closure isolate_shutdown_callback_;
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FML_DISALLOW_COPY_AND_ASSIGN(DartIsolateGroupData);
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};
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} // namespace flutter
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#endif // FLUTTER_RUNTIME_DART_ISOLATE_GROUP_DATA_H_
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